Submitted on: 04 October 2010.
Revised on: 21 November 2010.
Accepted on: 19 January 2011.
___________________Economics of Transportation---ELSEVIER
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Submitted on: 24 September 2006.
Revised on: 13 November 2006.
Accepted on: 28 December 2006.
___________________Economics of Transportation---ELSEVIER
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Submitted on: 18 January 2025.
Revised on: 23 March 2025.
Accepted on: 20 May 2025.
___________________Economics of Transportation---ELSEVIER
Submitted on: 02 October 2001.
Revised on: 09 November 2001.
Accepted on: 06 December 2001.
___________________Economics of Transportation---ELSEVIER
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Submitted on: 27 December 2016.
Revised on: 05 February 2017.
Accepted on: 21 March 2017.
___________________Economics of Transportation---ELSEVIER